Telephone switch-hook.



'PATENTED APR. 30, 1907.

A. LARSSON.

TELEPHONE SWITCH HOOK.

APPLIOATJION FILED MAY 22, 1906.

INVENTOH Wad l/644W I WITNESSES 4 ATTORNEY RRls PETERS cov, wAsmNanm, n, a

ALFRED LARSSON, OF BUFFALO, NEW YORK.

TELEPHONE SWITCH-HOOK.

Specification of Letters Patent.

Patented April 30, 1907.

Application filed May 22,1906. Serial No. 318,148.

To aZZ whom it nuty concern.-

Be it known that I, ALFRED LARSSON, a subject of the King of Sweden, residing at Buffalo, New York, have invented certain new and useful Improvements in Telephone Switch-Hooks, of which the following is a specification.

The present invention relates to telephone switches and has special reference to means for adjusting the contact springs of the switches in relation to the switch hook.

In the constructionsheretofore employed it has generally been necessary to bend the contaetsprings to a greater or less extent before the proper adjustment is obtained, and by the use of my improved construction this disadvantageous feature is avoided.

The principal object of my invention is to produce a switch of such character that all bending of the springs may be dispensed with and the position of the springs in relation to the switch hook may be adjusted independently of the hook and before the switch is placed in proper position. v

The invention consist essentially in securing the contact springs to a suitable bridge provided with means which will permit of the adjustment of the springs at any desired angle.

in the accompanying drawings wherein l have illustrated the preferred form of my invention, Figure 1 is a sectional view of a telephone case showing my improved invention in side elevation, Fig. 2 is an end elevational view of the apparatus, and a section on the line 22 of Fig. 1; and Fig. 3 is a top plan view with the bridge and contact springs shown in dotted lines.

Referring to the drawing 1 designates a telephone case with an aperture 2 through which the switch hook 3 projects. The switch hook is fulerumed at 4L and contacts with an upwardly extending spring 5 secured to a plate 6 which is fastened at a suitable part of the casing 1.

At a point substantially intermediate its length, the switch hook is designed to bear on a rod or plunger 7 which plays in a bore 8 formed in the telephone case and also projects through an opening 9 in the plate 10 which is secured to the lower face of the telephone case by screws 11 and bolt 11. Associated with the plate 10 is a bridge 12 which carries contact springs 13, 14, 15 and 16 of which 15 is the main spring and is provided with a washer 17 against which the lower extremity of the plunger 7 bears. The several springs are separated from each other and from the bridge by insulation 17 and are held together and to the bridge by screws 18. The bridge is provided with upwardly projecting lugs or side bars 1S presenting curved edges which are designed to bear against the lower face of the plate 10. The bridge is also provided at obliquely opposite points with apertures 19 through which screws 20 pass to be threaded in suitable holes in the plate 10.

it will be obvious from the construction above described that the. reach of the main spring 15 in relation to the plunger 01' rod 7 may be increased or decreased by a suitable tilting of the bridge in any direction and fastening the same in its tilted position by means of the screws 20. in this manner the contact springs may be properly adjusted in relation to the switch hook without bending and as a result weakening the springs.

The construction herein described is susceptible of modification in numerous particulars and l deem such modifications to fall within the spirit of my invention, the latter being defined by the accompanying claims.

Having thus described my invention and what 1 claim as new and desire to secure by Letters Patent is z 1. In a device of the character described, the combination of a tilting bridge carrying a set of contacts, a plunger designed to bear upon one of said contacts, a telephone switch hook associated with and adapted to operate said plunger and means for adjusting said bridge and said contacts in relation to the plunger,

2. In a device of the character described, the combination of a tilting bridge, a set of contacts carried thereby, a telephone switch hook arranged above said bridge, a plunger interposed between and adapted to move freely between said switch hook and contacts and means for adjusting said bridge and contacts relatively to said plunger.

3. In a device of the character described, a bridge carrying a set of contacts, a plunger arranged at an angle to said contacts and being designed to bear upon one of them, a telephone switch hook normally in engagement with said plunger and means upon the bridge for tilting the same and adjusting the contacts in relation to the plunger. 1

ger adapted to bear upon one of said contact ger, and upwar ly extending lugs upon said 4. In a device of the character described, a bridge carrying a set of contacts, said bridge being provided with upwardly projecting lugs, whereby, said bridge may be tilted.

5. In a device of the character described, a bridge carrying a set of contacts, said bridge having upwardly extending lugs and being provided with apertures at obliquely opposite corners thereof.

6. In a device of the character described, the combination of a switch hook, a series of contact springs arranged therebelow, a plunsprings at one end, and upon said switch hook at the other end, a bridge carrying the said contact springs, said bridge being provided with upwardly projecting arms having curved faces, whereby, the contact springs may be adjusted at any desired angle in relation to said plunger.

7. In a device of the character described, the combination of a bridge, a set of contact springs carried by said bridge, one of said springs being extended beyond the others and having a washer provided near its end, a plunger adapted to bear upon said washer, a switch hook ada ted to bear upon said plunbridge by means of which the latter and the contact springs carried thereby may be ad justed in relation to said plunger.

8. In a device of the character described,

the combination of a plate, a bridge remov-' ably held thereby, upwardly extending lugs upon said bridge by means of which the latter may be tilted, a set of contact springs carried by said bridge, a plunger arranged at substantial right angles to said contact springs and adapted to bear upon one of said springs, and a telephone swltch hook normally bearing upon said plunger.

9. In a device of the character described, the combination of a plate, a bridge removably associated therewith, lateral upwardly extending lugs having curved faces forming a part of said bridge, and by means of which the latter may be tilted, a set of contact springs carried by said bridge, a telephone switch hook arranged above the bridge, and a plunger interposed between said switch hook and one of said contact springs.

10. In a device of the character described, the combination of a plate, a bridge associated therewith having apertures at diagonally opposite corners thereof, fastening means extending through said aperture into said plate, upwardly extending lugs upon said bridge by means of which the latter may be adjusted, a set of contact springs carried by said bridge a telephone switch hook arranged above the bridge, and a plunger freely movable between the switch hook and one of the contact springs.

In testimony whereof I have aflixed my signature in presence of two witnesses.

ALFRED LARSSON.

Witnesses:

CARL H. SMITH, HERVEY J. DRAKE. 

